What is air sealing?

This is the latest trend in building performance. Air sealing means we make your home air tight to control energy loss, moisture intrusion, and air quality. The most important step in air sealing is to seal the attic deck. In the typical home there are dozens if not hundreds of cracks, gaps, and holes in the attic deck that allow air to pass between the attic and your living space.
  • Can lights
  • Bathroom vents
  • Chimney chase
  • Attic hatch
  • Plumbing penetrations
  • Electrical penetrations
  • Video projectors, Video screens
  • Architectural Features
  • Wall top plates

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 Why do walls leak air?

Any penetration through the sheetrock of the wall lets air into the wall cavity.
  • Electrical outlets
  • Light swtiches
  • Phone or data connections
  • Picture mounts
In addition to this, all along the bottom plate there can be tiny air gap between the sheet rock and wood. Air passes through the carpet, under the moulding, behind the sheetrock and into the wall cavity. Consider the linear feet of wall inside your home and all along the bottom of this wall there are tiny air leaks.

What causes air movement?

Air is forced in and out of your home through air leaks by these pressure sources:


Wind creates positive pressure on one side of your house and negative pressure on the other side. In Southern California we regularly experience Santa Ana Winds and onshore breezes.

Stack effect

In summertime stack effect can be a major issue. Air conditioned air is cold and heavy. It collects in the downstairs and builds pressure to exit your home. At the foundation level there are often a variety of leakage pathways. As cold air pours out the bottom of your house, it sucks hot air into the house from the attic.

Convective loops

Interior walls are usually hollow. This confined space creates a convective loop that absorbs energy from your living space and carries it away.

Shock waves

Every time a door is opened or closed it creates a pressure shock wave through your home. This pressure is relieved by air leaking in or out of your home. Consider these four factors and it becomes clear there is A LOT of air that leaks in and out of your home, carrying your energy and money with it.

How do we air seal my home?

The answer is foam, and do the attic first. Of course there are other methods, but spray foam is the most economical, practical, and effective.

Foam in the attic

Step 1: Remove attic insulation and clean the attic deck. Step 2: Prep the attic by draping and taping where needed. Step 3: Install a layer of open cell foam to cover the entire attic deck.


Seal exterior doors and windows Seal around flooring

Foam in walls

Foam insulation may be injected into your exterior and interior walls. Foam creates air-tight insulation in your wall and prevents air movement through the cavity.

Air leaks in the attic

Attics are the most common location for air leaks. Plumbing and electrical wires leave a path that air can pass in and out of your living space through the attic. Attic air is probably the most unhealthy air in your home.

Darkened insulation indicates air has been leaking through it. The insulation acts like an air filter.

 The best solution:

  • Remove existing fiberglass or cellulose insulation
  • Spray a layer of foam covering the entire attic
  • Foam is great insulation and also an air barrier

Spray foam is the solution to the problem of air leaks in the attic

Almost every attic shows signs of air leaks. Air leaks mean lost energy and wasted money

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